So, he wants a divorce. Our of the blue

[ch33sy]

He says there isn't anyone else, and that he's just not been happy for a while. We went through this about 4 years ago and it was a wake up call for what we were losing and our relationship improved, (or it did for me) but he says he regrets not going through with it last time and won't consider trying any more

In his defence many of us imagine walking away from a stressful busy life. Adding a disabled dc to that mix must be added responsibility -
Maybe he was just absentmindedly thinking aloud. Hope things work out the way you both want op...